Power generation system and method with voltage fault ride-through capability

a power generation system and fault technology, applied in the direction of electric generator control, dynamo-electric converter control, machines/engines, etc., can solve the problem of significant system voltage drop

Inactive Publication Date: 2014-04-08
AI ALPINE US BIDCO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These traditional plants have excellent economies of scale but usually transmit electricity long distances and can affect to the environment.
When a fault in the utility system occurs, voltage in the system could decrease by a significant amount for a short duration (typically less than 500 milliseconds).
These types of faults occur during lightning and wind storms, or due to a transmission line being connected to the ground by accident.

Method used

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  • Power generation system and method with voltage fault ride-through capability
  • Power generation system and method with voltage fault ride-through capability
  • Power generation system and method with voltage fault ride-through capability

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Embodiment Construction

[0013]As discussed in detail below, embodiments of the present invention function to provide a system and a method for low voltage ride through capability of small synchronous generators with low moments of inertia connected to a power grid.

[0014]FIG. 1 illustrates a plot 10 of an example of a grid code voltage profile at the point of connection (POC) of a generator to the power grid. Some of the grid authorities expect that the generators should not be disconnected from the grid if the voltage at POC is higher than the voltage profile shown. However, this is one exemplary case, and the voltage profile requirement may vary from country to country or from grid authority to grid authority. The fault may occur due to lightning and wind storms, for example. The fault may be of type such as a single line to ground fault, double line fault, or three phase fault. The plot 10 shows a horizontal axis 12 representing time in milliseconds and a vertical axis 14 representing voltage in percenta...

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PUM

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Abstract

A power generation system includes a generator mechanically coupled to a turbine to generate electrical power. The system includes a fault ride through system having a variable resistor and a variable inductor. The variable resistor is connected in parallel across output terminals of the generator to absorb power from the generator during a grid fault condition, and the variable inductor is connected between an output terminal of the generator and a power grid.

Description

BACKGROUND[0001]This invention relates generally to electric energy conversion, and, more specifically, to a system and a method for low voltage ride through capability of small synchronous generators with low moments of inertia connected to a power grid.[0002]In traditional electric power systems, most of the electrical power is generated in large centralized facilities, such as fossil fuel (coal, gas powered), nuclear, or hydropower plants. These traditional plants have excellent economies of scale but usually transmit electricity long distances and can affect to the environment. Distributed energy resource (DER) systems are small power generators (typically in the range of 3 kW to 10,000 kW) used to provide an alternative to or an enhancement of traditional electric power systems. Small power generators may be powered by small gas turbines or may include fuel cells and / or wind powered generators, for example. DER systems reduce the amount of energy lost in transmitting electricit...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H02P11/00H02P9/04H02P9/00F03D9/00
CPCH02J3/38Y02E10/725H02J2003/388H02J2003/001H02H7/06H02P9/006H02J3/001H02J3/388Y02E10/72
Inventor DROBNJAK, GORANSCHRAMM, SIMON HERBERTSIHLER, CHRISTOF MARTIN
Owner AI ALPINE US BIDCO INC
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